Eevee thin glass surface
Give your material a small refraction depth.

From the manual

If Refraction Depth is not 0.0, all refraction BSDFs in the shader will act as if the object is a thin slab of the refraction material having this thickness. This will model a second refraction event that will double the absorption color and start the refraction ray after this second event.
This option greatly increases the quality of thin glass objects.